TLS 1.2 ciphers

Server NGINX
1

Chrome 29 came out recently and now supports TLS 1.2. So i decided to
add
some of the new TLS 1.2 ciphers to my webserver, which are specified
here:
/docs/manmaster/man1/ciphers.html.

My current setup is: Ubuntu 10.04, Nginx 1.5.3 ,OpenSSL 1.0.1e (build
myself)
Config file:

server {
listen 80;
server_name sherbers.de;
return 301 https://$server_name$request_uri;
}
server {
listen 443 ssl spdy default_server;
server_name sherbers.de;

ssl_certificate /etc/ssl/private/hosteurope/www.sherbers.de.pem;
ssl_certificate_key /etc/ssl/private/hosteurope/www.sherbers.de.key;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers

ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:DHE-RSA-AES256-SHA;
ssl_prefer_server_ciphers on;
ssl_session_cache shared:SSL:10m;

As you can see i only use ciphers with perfect forward secrecy, because
why
not. When i connect to my webserver chrome shows it is using TLS 1.2 but
as
a cipher it using ECDHE-RSA, which it was using before too when i only
offered TLS 1.1, without any of the ECDHE-ECDSA ciphers.

Any idea why nginx doesn’t offers the new cipers?

Additional information:

  • An ssl check at https://sslcheck.globalsign.com doesn’t list any of
    the
    ECDHE-ECDSA ciphers
  • “openssl ciphers -v | grep ECDHE-ECDSA” outputs the following:
    ECDHE-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA
    Enc=AESGCM(256)
    Mac=AEAD
    ECDHE-ECDSA-AES256-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AES(256)
    Mac=SHA384
    ECDHE-ECDSA-AES256-SHA SSLv3 Kx=ECDH Au=ECDSA Enc=AES(256)
    Mac=SHA1
    ECDHE-ECDSA-DES-CBC3-SHA SSLv3 Kx=ECDH Au=ECDSA Enc=3DES(168)
    Mac=SHA1
    ECDHE-ECDSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA
    Enc=AESGCM(128)
    Mac=AEAD
    ECDHE-ECDSA-AES128-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AES(128)
    Mac=SHA256
    ECDHE-ECDSA-AES128-SHA SSLv3 Kx=ECDH Au=ECDSA Enc=AES(128)
    Mac=SHA1
    ECDHE-ECDSA-RC4-SHA SSLv3 Kx=ECDH Au=ECDSA Enc=RC4(128)
    Mac=SHA1

Posted at Nginx Forum:

2

Hello!

On Wed, Aug 21, 2013 at 01:19:01PM -0400, stephan13360 wrote:

server_name    sherbers.de;

ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:DHE-RSA-AES256-SHA;

ssl_prefer_server_ciphers on;
ssl_session_cache shared:SSL:10m;

As you can see i only use ciphers with perfect forward secrecy, because why
not. When i connect to my webserver chrome shows it is using TLS 1.2 but as
a cipher it using ECDHE-RSA, which it was using before too when i only
offered TLS 1.1, without any of the ECDHE-ECDSA ciphers.

Any idea why nginx doesn’t offers the new cipers?

ECDSA ciphers need an ECDSA certificate to work. As your cert is
RSA, it RSA ciphers are used.

–
Maxim D.
http://nginx.org/en/donation.html

3

Thanks. I never even considered that the certificate could be the
problem.

Maxim D. Wrote:

server {
S256-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:DHE-RSA-AES256-S
offered TLS 1.1, without any of the ECDHE-ECDSA ciphers.

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